ConstructionProblem4

Please form a 4x4 board by putting these four 2x2 fragments together! The empty point is shown with four liberties, but you can use it as a 1-1 point, 2-1 point or 2-2 point, just as you wish. Of course, it's also possible to turn the pieces! The formed position must be legal, each stone or group of stones should have at least one liberty :)